148 BOTANY. Townsendia* Rotheockii, Gray,t in herb. — Perennial, stemless; leaves narrowly spatulate, narrowed into a petiole as long as the blade, both together 1' long; blade thickish, entire, smooth; petiole expanded toward its insertion, and with a few silky hairs ; heads sessUe, 1' in diam¬ eter, obtuse scales of the involucre in 3-4 series, oblong or narrowly oval, purphsh, thickish, margins distinctly ciliate, or toward the apex sometimes shghtly fimbriate lacerate ; rays fertile, blue or purplish, exceeding the disk by one-half, 1-1^" wide, entire or toothed; pappus somewhat united at base, squamellate-subulate, one-fourth as long as the tube, with one or two-bristles exceeding the others; disk-flowers yeUow, about as long as the rather unequal pappus; achenia rather hairy, oblong, flattened. Heads one or more from the same caudex. Apparently a somewhat variable species, but sufficiently distinct from T. sericea, to which it most neariy approaches by the obtuser scales to the involucre, the shorter and broader rays, and the short pappus of the ray-flowers. It wiU hence be observed that it approaches Nanastrum, though kept distinct by its perennial root.— South Park, Colorado, at 13,500 feet (875). (Also either 418 or 417 of the already distributed sets, but from a mixing of labels I cannot determine which.)—Plate VII, A. Natural size. 1 Inner involucral scale. 2. Ray- flowers. 3. Ray-style and stigma. 4. Portion of ray-pappus, magnified about 25 diameters. 5. Disk-flower. 6. Cross-section of achenium. 7. Style and stigma of disk-flower. 8. Bristle from ray-pappus. AU enlarged about 10 diameters, except where otherwise specified. Townsendia seeicea. Hook.—Resembling the above in general habit, but differing in having silky-canescent and narrower leaves, acute scales to the involucre, longer and narrower rays, and a longer pappus to the ray-flowers.—Colorado (419), at Kit Carson (on the plains), and also a var. with shorter rays and more hairy and narrower leaves at Georgetown, among the mountains. * Townsendia, Hook.—Heads radiate ; rays fertile; disk-flowers perfect or sometimes [both ?] infer¬ tile. Involucre hemispherical or broadly campanulate, the lanceolate bracts imbricated in a few series, the exterior smaller, margins scarious. Eeceptacle plane, naked or fimbrillate. Eays longer than the involucre, entire or toothed; disk-flowers regular, tubular, the limb narrowly campanulate or a little dilated with 5 short teeth. Anthers at base ohtuse, entire. Branches of the style in the disk-flowers flattened, with lanceolate appendages. Disk-achenia compressed, those of the ray 3-angled, the scabrous or barbellate pappus rigid, unequal.—Low perennial or annual herbs, more or less canescent.—Eocky Mountain Eegion between the Saskatchewan and New Mexico.—Bentham & Hooker. t Dr. Gray has indicated T. scapigera, D. C. Eaton, as the nearest relative of this species.